WO1999058034A1 - A beverage maker - Google Patents
A beverage maker Download PDFInfo
- Publication number
- WO1999058034A1 WO1999058034A1 PCT/GB1999/001497 GB9901497W WO9958034A1 WO 1999058034 A1 WO1999058034 A1 WO 1999058034A1 GB 9901497 W GB9901497 W GB 9901497W WO 9958034 A1 WO9958034 A1 WO 9958034A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- disc
- screw
- vessel
- beverage maker
- beverage
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J31/00—Apparatus for making beverages
- A47J31/18—Apparatus in which ground coffee or tea-leaves are immersed in the hot liquid in the beverage container
- A47J31/20—Apparatus in which ground coffee or tea-leaves are immersed in the hot liquid in the beverage container having immersible, e.g. rotatable, filters
Definitions
- This invention relates to a beverage maker of the kind which comprises a cylindrical chamber having a closed end, a pouring spout spaced from the closed end and a separator piston disc which is slidable within the cylindrical chamber between the pouring spout and the closed end, the separator piston disc being permeable to water and the beverage whilst being impenetrable to solid raw material from which the beverage is made and being adapted to be driven towards the closed end of the cylindrical chamber, the arrangement being such that the solid raw material, which is usually in a granular form, is placed in the cylindrical chamber between the closed end and the separator piston disc and the cylindrical chamber is filled with hot water which interacts with raw material to form the beverage, the separator piston disc being driven towards the closed end to separate the residue of the raw material from the resultant beverage.
- a beverage maker is referred to in the rest of this description as "a beverage maker of the kind referred to”. More particularly, although not exclusively, this invention relates to a coffee maker.
- the coffee maker When the cylindrical chamber of a coffee maker is first charged with coffee and hot water to make coffee, the coffee maker is left standing with the separator piston disc at the end of is travel remote from the closed end of the cylindrical chamber for a time sufficient to allow the coffee to brew.
- the cylindrical chamber is the interior of a jug which has a lid and if the separator piston disc is the head of a piston which has a piston rod which extends through an aperture in the lid so that the separator piston disc is caused to slide either way in the cylindrical chamber by the application of a thrust applied by hand to the piston rod, the piston rod will project upwards from the lid whilst the coffee maker is standing to allow the coffee to brew.
- the upstanding piston rod which is often a small diameter spindle, is liable to be knocked accidentally so that the coffee maker may be knocked over. Furthermore, if the lid simply sits on the brim of the jug and/or if there is a clearance around the piston rod in the aperture in the lid, the disc, the piston rod, and even the lid are likely to rock, so that the rod oscillates angularly relative to the axis of the jug in a random manner when the thrust is applied by hand to the piston rod, unless great care is taken to ensure that the line of action of the manually applied thrust is truly vertical and coincident with the axis of the jug and of the piston rod.
- An object of this invention is to minimise these problems for a user of a beverage maker of the kind referred to and more particularly to relieve the user of the need to take care to keep the piston rod vertical when causing the separator piston to travel downwards within the jug.
- a beverage maker of the kind referred to including angularly movable input effort applying means and coupling means coupling the angularly movable input effort applying means with the separator piston disc, the coupling means including angular to linear movement conversion means whereby the input effort to drive the separator piston disc for rectilinear movement within the cylindrical chamber is applied to the beverage maker as a torque. It may be applied by hand. Alternatively, it could be applied mechanically or electrically.
- a preferred embodiment of this invention is a coffee maker including an open topped vessel having a base and substantially straight sides upstanding from the periphery of the base and forming the cylinderical chamber and the pouring spout, a lid for fitting to the open top whereby to enclose the interior of the vessel, the separator piston disc having a planform profile similar to that of the base, means for driving the disc downwards within the vessel to separate the residue of the coffee grains from the liquid, the disc being provided with a seal around its periphery, the seal being operably cooperative with the sides of the vessel so as to seal against passage of coffee grains between the disc and the sides of the vessel from below the disc to the part of the interior of the vessel above the disc, wherein the coupling means comprise a screw which depends from the lid by which it is supported for rotation about its axis relative to the lid, the angularly movable input effort applying means being a component which is fixed to the upper end of the screw and which is accessible from above the lid so that it can be turned whereby to turn the screw
- the screw has a multi-start thread, especially a two start or a four start thread.
- the lid which would be removable, may be releasably fixed to the top of the vessel.
- the seal could be a circumferentially-continuous lip seal arranged with its annular recess facing the base of the vessel.
- the separator piston disc could be a moulding, one or more portions of which comprise a mesh which is incorporated in structure of the remainder of the disc during molding.
- the seal and the disc, including the mesh portion or portions incorporated therein, could be formed in a single mould, the molding process being a two shot process, one shot moulding the disc with the mesh portion or portions therein and the other shot moulding the seal.
- the piston of a coffee maker which is a beverage maker of the kind referred to, locks in mid- stroke whilst it is being driven down towards the closed end of the cylindrical chamber. This is due to a concentration of coffee grounds building up under the piston ring seal and acting as a wedge between the piston ring seal and the cylindrical wall along which it slides, to impede further downwards movement of the piston.
- the vessel is formed as a plastics moulding so that the sides of its interior taper from top to bottom as is customary with plastics mouldings for moulding reasons, it is difficult to ensure that the lip seal adequately seals at the top of the vessel without the friction between the soft material of the seal and the side of the vessel becoming excessive as the piston descends towards the base.
- a separator piston disc and peripheral ring seal for a beverage maker of the kind referred to which is a one-piece mesh disc having a major planar portion and a flared circumferentially extending peripheral portion which serves as the peripheral ring seal portion, the arrangement being such that, when the one-piece mesh disc is fitted into a beverage maker of the kind referred to, its peripheral edge is in sliding contact with the inner surface of the cylindrical wall and is displaced axially with respect to the major planar portion, being nearer to the base of the cylindrical chamber than is that major planar portion.
- the major planar portion has a central aperture in which a nut member is fitted for engagement with the screw of the aforesaid preferred embodiment of coffee maker.
- the major portion of the one-piece mesh disc may be reinforced by radial ribs which project from the nut member over the face of the major planar portion which is further from the peripheral edge.
- the vessel and the disc have a non-circular cross-section or a projection from the inner wall of the vessel is provided which projects into the soft material of the lip seal, there is a tendency for the disc to rotate relative to the vessel, a leading portion of the soft plastic material of the lip seal tending to compress whilst a trailing portion tends to be separated from the vessel sufficiently for there to be leakage of coffee grains between the seal and the vessel wall which would not be satisfactory.
- a beverage maker of the kind referred to wherein the means for driving the disc towards the closed end of the cylindrical chamber include a screw which depends from the lid by which it is supported for rotation about its axis relative to the lid, the disc being formed as a nut which is in screwthreaded engagement with the screw so that it slides within the vessel with rotation of the screw and an elongate member depends from the lid through an aperture in the disc substantially parallel to the screw, the lower end of the elongate member being linked to the screw and the elongate member being a sliding fit in the aperture of the disc .
- Figure 1 is a schematic illustration in transverse section of one of the coffee makers
- Figure 2 is a view on arrow A in Figure 1 of a component of the coffee maker
- Figure 3 is a fragmentary schematic illustration of the upper part of a modified coffee maker, the modification being to the rotary cap;
- FIG 4 is a view similar to Figure 1 of the other coffee maker.
- Figure 1 shows that the coffee maker comprises a hollow vessel 10 in the form of an open topped jug having a pouring spout 11 and which is closed at its upper end by a lid 12 which is realisably fixed to the brim of the jug.
- the lid 12 is annular and is formed by moulding.
- the interior of the vessel 10 is a substantially cylindrical chamber.
- a rotary cap 13 has an upper portion 13A which has an outside diameter greater than the diameter of the central aperture 14 of the lid 12 and a depending cylindrical boss 13B which is spigotted into that central aperture 14.
- the cylindrical boss 13B is formed at its lower end with a circumferentially continuous rib 13C which is snap fitted through the central aperture 14 of the annular lid 12 whereby the rotary cap 13 is retained against axial displacement relative to the lid 12 but can be rotated relative to the lid 12.
- a socket 15 is formed substantially coaxially in the rotary cap 13, the socket 15 opening downwardly.
- the rotary cap 13 is formed by moulding.
- a two start thread leadscrew 16 is spigotted into the socket 15 of the rotary cap 13 and depends therefrom through the centre of the cylindrical chamber of the vessel 10 so that its lower end is close to the base 10A of the vessel 10.
- the thread is formed on the exterior surface of the leadscrew 16 and the latter is formed by moulding. Indeed the rotary cap and the leadscrew could be moulded as a one-piece component.
- the lower end of the leadscrew 16 carries a circlip 17 and may be located relative to the base 10A by an upstanding projection (not shown) which is formed integrally with the base 10A and which seats in a hole that is formed in the bottom of the leadscrew 16.
- a piston disc 18 is screw fitted onto the leadscrew 16 in the manner of a nut.
- the disc 18 is a one piece moulding.
- Figure 2 shows that the disc 18 comprises an annular peripheral portion 19 with four mutually perpendicular radial rib portions 20 and a central ring portion 21, there being integral mesh portions 22 spanning the apertures bounded by each adjacent pair of the rib portions 20 and the arcuate part of the peripheral portion 19 that joins the outer ends of the rib portions 20.
- the radial rib portions 20 provide reinforcement.
- the mesh portions 22 are formed of a woven fabric which is incorporated automatically in the moulded disc 18 during the moulding step by which the latter is formed.
- the central ring portion 21 has a thread formed in its central aperture, that being the thread which engages the thread of the leadscrew 16.
- a moulded lip seal 23 which is formed of a soft sealing material, that is to say a plastics material which is softer than the material from which the peripheral portion 19, the radial rib portions 20 and the central ring portion 21 of the disc 18 are moulded, is fitted around the radially outer periphery of the disc 18.
- the lip seal 23 is formed by the second shot of a two shot moulding process which is performed in a single mould, the first shot being the formation of the disc 18.
- the lip seal 23 is a circumferentially continuous ring.
- the annular arcuate recess that is formed by the lip seal 23 faces the base 10A of the vessel 10.
- the lid 12, the rotary cap 13, the leadscrew 16 and the piston disc 18 are removed from the vessel 10. Coffee grains are introduced into the vessel 10 through the open top.
- the vessel 10 is filled with water to just below the spout.
- the lid 12, rotary cap 13, leadscrew 16 and piston disc 18 are refitted with the piston disc 18 adjacent the lid 12.
- the user rotates the upper portion 13A of the rotary cap 13 manually thereby rotating the leadscrew 16 and driving the piston disc 18 down towards the base 10A of the vessel 10 whereby to separate the residue of the coffee grains from the liquid, liquid coffee being allowed to pass through the interstices of the mesh portions 22 of the piston disc 18 during travel of the piston disc 18.
- the circlip 17 limits downwards travel of the piston disc 18 and ensures that the latter is removed from the vessel 10 with the leadscrew 16 for charging and cleaning.
- Use of a multi-start thread, especially a two start thread gives a larger displacement of the piston disc 18 for rotation of the cap 13 than would be achieved by a single start thread. It also helps to overcome resistance to movement of the piston disc 18 due to friction of the lip seal 23 on the sides of the vessel 10 and gives a more even distribution of load around the leadscrew so that the action of the mechanism is smooth.
- the circumferentially continuous lip seal 23 is intended to provide a circumferentially continuous barrier to the passage of coffee grains between the periphery of the piston disc 18 and the inner wall of the vessel 10. The piston disc 18 contributes to the location of the leadscrew 16 within the vessel 10.
- Figure 3 shows that the rotary cap could be replaced by an arm 24 which is fixed to the top of the leadscrew 16A that projects up through the central aperture 14 of the lid 12.
- the arm 24 may have a rotary knob 25 at its outer end.
- the rotary cap 13 may be provided with such an arm which may be hinged to the cap so that it can be folded and stowed within the planform area of the upper portion 13A of the cap 13 and folded out only when it is needed to turn the leadscrew 16.
- Rotation of the leadscrew 16 could be powered either mechanically or electrically as an alternative to the manual operation described above.
- the annular lid could be simply seated on the brim of the vessel 10 rather than being realisably fixed thereto as described above.
- the vessel 10 could be circular in cross-section in which case provision should be made to constrain the piston disc 18 from rotating with the leadscrew 16.
- the vessel 10 could be made of glass.
- the leadscrew could be machined from stainless steel.
- the mesh portions of the piston disc could comprise a series of circular holes for strength reasons.
- Figure 4 shows another form of coffee maker in which this invention is embodied. Parts of the coffee maker shown in Figure 4 which are similar to corresponding parts of the coffee maker shown in Figures 1 and 2 are identified by the same reference numeral.
- the vessel 10 is formed by moulding. As is usual with such moulded products, the side walls of the vessel 10 taper slightly towards the base of the vessel 10. It may be circular or non-circular in cross-section.
- the leadscrew 16B has a four-start thread.
- the leadscrew 16B could be produced by selecting a length of bar having a cross-section which is substantially square with shallow concave faces and by twisting that length of bar to form it into the leadscrew 16B.
- a nut member 26 is screw-fitted onto the lead screw 16B.
- the nut member 26 is formed as part of a one-piece plastics moulding which also includes a number of radially extending ribs 27 of which two are shown in Figure 4.
- the lower portion of the nut member 26 extends through the central aperture of an annular separator piston disc 18A so that the ribs 27 extend over the upper surface of a central planar portion 28 of the piston disc 18A.
- the planar portion 28 is a major portion of the piston disc 18A.
- the remainder of the piston disc 18A comprises a flared circumferentially extending peripheral portion 29.
- the flared peripheral portion 29 presents an annular concave surface to the base 16A and has a peripheral edge 31 which is nearer to the base 10A than is the major planar portion 28.
- the radial ribs 27 provide reinforcement for the major planar portion 28.
- the annular separator disc 18A is heat formed from a thin plastics mesh material.
- the mesh material of the separator disc 18A is cut from a sheet of such thin mesh material before it is heat formed into the disc 18A. The cut edges would have been frayed edges, comprising circumferentially spaced strands of the plastics material of the mesh.
- the mesh is joined to the nut member 26 at the edge of the central aperture as well as to the undersides of the ribs 27. It may be so joined as part of the moulding process by which the nut member 26 with its ribs 27 was formed. Alternatively it may be so joined by bonding. In another embodiment the mesh may be clamped to the undersides of the ribs 27 by similar ribs below the mesh.
- a rod 32 depends from the lid 12 substantially parallel to the leadscrew 16B and to one side of the leadscrew 16B partway between the leadscrew 16B and the side of the vessel 10.
- the rod 32 is a sliding fit in an aperture 33 which extends through one of the ribs 27 and the planar portion 28 of the mesh material separator disc 18A.
- a link 34 is joined at one end to the bottom of the rod 32. The lower end of the leadscrew 16B is journalled in the link 34. If the cross-section of the vessel 10 is not circular, the rod 32 ensures that the lid 12 and the annular separator piston 18A are aligned one with another for insertion into the vessel.
- the link 34 limits downwards travel of the piston disc 18A and ensures that the latter is removed from the vessel 10 with the lead screw 16B for charging and cleaning.
- the rod 32 constrains the piston 18A from turning with the leadscrew 16B.
- the fabric nature of the mesh material of the peripheral portion 29 of the annular separator piston 18A and its frayed edge 31 cater for the taper of the interior of the vessel 10.
- the peripheral portion 29 readily conforms to the inner surface of the sides of the vessel 10 against which it is held by the pressure of the mixture of undissolved coffee grains and liquid as it is slid along the inner surface of the vessel 10 towards the base 10A with movement of the piston disc 18A towards the base 10A.
- the fact that the peripheral portion 29 is circumferentially continuous ensures that it provides a circumferentially continuous barrier to the passage of coffee grains between it and the inner wall of the vessel 10.
- the diameter of the frayed edge 31 is sufficient to ensure contact between the peripheral portion 29 and the inner surface of the sides of the vessel 10 at the top of the travel of the piston disc 18A. Hence that contact will increase with movement of the piston disc 18A towards the base 10A.
- the annular separator piston disc 18A could be formed from an appropriate thin woven metal mesh rather than from the thin plastics mesh material described above.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Apparatus For Making Beverages (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK99921018T DK1077930T3 (en) | 1999-05-12 | 1999-05-11 | Benzamide derivatives for the treatment of cytokine-mediated diseases |
EP99922292A EP1076502A1 (en) | 1998-05-12 | 1999-05-12 | A beverage maker |
US09/674,889 US6324967B1 (en) | 1998-05-12 | 1999-05-12 | Beverage maker |
CA002331488A CA2331488A1 (en) | 1998-05-12 | 1999-05-12 | A beverage maker |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9810154.6 | 1998-05-12 | ||
GBGB9810154.6A GB9810154D0 (en) | 1998-05-12 | 1998-05-12 | A beverage maker |
GBGB9901152.0A GB9901152D0 (en) | 1999-01-19 | 1999-01-19 | A beverage maker |
GB9901152.0 | 1999-01-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999058034A1 true WO1999058034A1 (en) | 1999-11-18 |
Family
ID=26313655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/001497 WO1999058034A1 (en) | 1998-05-12 | 1999-05-12 | A beverage maker |
Country Status (4)
Country | Link |
---|---|
US (1) | US6324967B1 (en) |
EP (1) | EP1076502A1 (en) |
CA (1) | CA2331488A1 (en) |
WO (1) | WO1999058034A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000042890A1 (en) | 1999-01-19 | 2000-07-27 | Windmill Holdings Limited | A beverage maker |
WO2008078110A2 (en) * | 2006-12-23 | 2008-07-03 | Gavin Thomson | Apparatus for preparing an infused beverage |
US9232873B2 (en) | 2013-06-03 | 2016-01-12 | Starbucks Corporation | Method for brewing a beverage |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6821541B2 (en) * | 2002-06-03 | 2004-11-23 | Sin Hang Lee | Anaerobic tea steeper and method of use |
CA2418741A1 (en) * | 2003-02-12 | 2004-08-12 | Trudeau Corporation 1889 Inc. | System and method for making infused beverages |
US7040218B1 (en) * | 2003-10-15 | 2006-05-09 | Biolchini Jr Robert F | Stirring coffee press |
US20050109689A1 (en) * | 2003-11-20 | 2005-05-26 | Trachtenbroit Lawrence M. | Methods and apparatuses for filtering |
US7578231B2 (en) * | 2004-07-30 | 2009-08-25 | Pacific Cornetta, Inc. | Plunger and lid apparatus for a beverage press and a beverage press having same |
MX2008003736A (en) | 2005-04-11 | 2009-01-29 | Starbucks Corp | Machine for brewing a beverage such as coffee and related method. |
WO2007027206A2 (en) | 2005-04-11 | 2007-03-08 | Coffee Equipment Company | Machine for brewing a beverage such as coffee and related method |
WO2008067407A2 (en) | 2006-11-28 | 2008-06-05 | Htss Capital Llc | Anti-splash device for a beverage container |
DE102008030623A1 (en) * | 2008-01-03 | 2009-07-09 | Umsonst-Kübler, Petra | Device for mixing a mass |
US20100193549A1 (en) * | 2008-10-24 | 2010-08-05 | James Ronald Sirkis | Container for storing and dispensing a flowable material |
US20100275785A1 (en) * | 2009-04-29 | 2010-11-04 | Michael Weissman | Automatic french press |
EP2248449A1 (en) * | 2009-05-08 | 2010-11-10 | Koninklijke Philips Electronics N.V. | Kitchen appliance |
US8313644B2 (en) | 2010-01-13 | 2012-11-20 | OZOlab | Bottle with an integrated filtration assembly that is manually operated using a plunger |
US20160194587A1 (en) * | 2015-01-02 | 2016-07-07 | Brian Ellegood | Brewing, fermenting, and service kettle keg with compression displacement plate |
WO2017210554A1 (en) * | 2016-06-02 | 2017-12-07 | Herndon Jeffrey R | Container assembly and accessories therefor |
US11638891B2 (en) * | 2017-05-23 | 2023-05-02 | Kohler Co. | Water filter system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE74757C (en) * | J. scheibe in Berlin, Schlesischesfr. 38, und W. BOSS in Nieder-Schönweide | Coffee and tea machine with a piston-like prefilter | ||
US2935928A (en) * | 1957-02-28 | 1960-05-10 | Ethel M Keating | Coffee pot or the like |
FR80894E (en) * | 1962-01-05 | 1963-06-28 | Suction filter coffee maker | |
FR2300532A1 (en) * | 1975-02-13 | 1976-09-10 | Bondanini Faliero | Close fitting filter for coffee percolator - has resilient plastic disc supporting filter gauze |
DE2647467A1 (en) * | 1976-10-21 | 1978-04-27 | Braun Ag | Automatic coffee making machine - has container for liquid with lid, heater and filter and has hole for threaded rod |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US161640A (en) * | 1875-04-06 | Improvement in coffee-pots | ||
FR1311136A (en) | 1961-04-10 | 1962-12-07 | Suction filter coffee maker | |
US3307474A (en) | 1965-04-14 | 1967-03-07 | Boonton Molding Company Inc | Coffee brewing apparatus with means for removing used coffee grounds |
GB2070917A (en) | 1980-01-22 | 1981-09-16 | Howitt G | Preparation of beverages |
GB9411268D0 (en) * | 1994-06-06 | 1994-07-27 | Brasilia Uk Ltd | Filter apparatus |
-
1999
- 1999-05-12 EP EP99922292A patent/EP1076502A1/en not_active Withdrawn
- 1999-05-12 US US09/674,889 patent/US6324967B1/en not_active Expired - Fee Related
- 1999-05-12 CA CA002331488A patent/CA2331488A1/en not_active Abandoned
- 1999-05-12 WO PCT/GB1999/001497 patent/WO1999058034A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE74757C (en) * | J. scheibe in Berlin, Schlesischesfr. 38, und W. BOSS in Nieder-Schönweide | Coffee and tea machine with a piston-like prefilter | ||
US2935928A (en) * | 1957-02-28 | 1960-05-10 | Ethel M Keating | Coffee pot or the like |
FR80894E (en) * | 1962-01-05 | 1963-06-28 | Suction filter coffee maker | |
FR2300532A1 (en) * | 1975-02-13 | 1976-09-10 | Bondanini Faliero | Close fitting filter for coffee percolator - has resilient plastic disc supporting filter gauze |
DE2647467A1 (en) * | 1976-10-21 | 1978-04-27 | Braun Ag | Automatic coffee making machine - has container for liquid with lid, heater and filter and has hole for threaded rod |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000042890A1 (en) | 1999-01-19 | 2000-07-27 | Windmill Holdings Limited | A beverage maker |
WO2008078110A2 (en) * | 2006-12-23 | 2008-07-03 | Gavin Thomson | Apparatus for preparing an infused beverage |
WO2008078110A3 (en) * | 2006-12-23 | 2008-10-02 | Gavin Thomson | Apparatus for preparing an infused beverage |
US9232873B2 (en) | 2013-06-03 | 2016-01-12 | Starbucks Corporation | Method for brewing a beverage |
Also Published As
Publication number | Publication date |
---|---|
CA2331488A1 (en) | 1999-11-18 |
EP1076502A1 (en) | 2001-02-21 |
US6324967B1 (en) | 2001-12-04 |
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